JAVA读取文件的字符方法

 

 

public StringBuilder readFileByChars(String fileName) {
        StringBuilder strReadCode = new StringBuilder();
     File file = new File(fileName);
        Reader reader = null;
        try {
            System.out.println("");
            reader = new InputStreamReader(new FileInputStream(file));
            int tempchar;
            while ((tempchar = reader.read()) != -1) {
             strReadCode.append((char) tempchar);
            }
            reader.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
  return strReadCode;
    }

 

 public static void appendText(String fileName, String content) {
        try{           
            FileWriter writer = new FileWriter(fileName, true);
            writer.write(content);
            writer.close();
        } catch (IOException e){
         e.printStackTrace();
        }
    }